Remarkably Improved Gas Separation Performance of Polyimides by Forming“Bent and Battered”Main Chain Using Paracyclophane as Building Block

作     者：Lu-Jun Huang Ya-Tao Weng Aqib Raiz Zhi-Jie Mao Xiao-Hua Ma Lu-Jun Huang;Ya-Tao Weng;Aqib Raiz;Zhi-Jie Mao;Xiao-Hua Ma

作者机构：State Key Laboratory of Separation Membranes and Membrane ProcessesTiangong UniversityTianjin300387China School of Materials Science and EngineeringTiangong UniversityTianjin300387China Jiangxi Key Laboratory of Organic ChemistryJiangxi Science&Technology Normal UniversityNanchang330013China 

出 版 物：《高分子科学:英文版》 (Chinese Journal of Polymer Science)

年 卷 期：2023年第41卷第10期

页      面：1617-1628页

核心收录：

学科分类：080706[工学-化工过程机械] 08[工学] 0807[工学-动力工程及工程热物理] 

基　　金：financially supported by the National Natural Science Foundation of China (Nos. 22078245 and 21861016) YLU-DNL Fund (No. 2022009) 

主　　题：Polyimide of intrinsic microporosity 2,2'-Paracyclophane Molecular intrinsic microporosity Gas separation Permeability/selectivity trade-off 

摘      要：The design and development of highly permeable,selective and stable polymer membranes are great challenges in the gas separation ***,we constructed two intrinsic microporous polyimides(6FPCA and 6FMCA)derived from two isometric diamines(PCA and MCA),which were synthesized by palladium catalyzed C—N coupling *** PCA and MCA diamines contain a hollow beaded structure of 2,2′-paracyclophane as a building block with a specified window size of 3.09Å.The chemical structures of monomers,polyimides were confirmed by NMR,FTIR,and elementary analysis.6FPCA and 6FMCA exhibit good solubility,excellent thermal stability,and mechanical properties.6FPCA exhibits much larger microporosity(434 versus 120 m2·g−1),FFV(0.22 versus 0.15),d-spacing(6.9 versus 5.9Å),and over 10 times higher permeability with a very little decrease in selectivity than the corresponding polyimide(6FpA)with a plane structure,which remarkably increased their separation performance from far below the 2008 Robeson Upper bounds to reach these limitations for O2/N2 and CO2/***,the 6FPCA also demonstrates good plasticization resistance,moderate aging properties,and high CO2/CH4 mixed-gas separation *** results indicate that paracyclophane subunit can be successfully incorporated into polymers to enhance their ultra-microporosity and separation properties,which open a new avenue for developing high performance gas separation membranes with topological ultra-micropores.